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MySQL 3.23, 4.0, 4.1 Reference Manual :: 15 MySQL Cluster :: 15.4 MySQL Cluster Programs :: 15.4.19 ndb_size.pl — NDBCLUSTER Size Requirement Estimator
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15.4.19. ndb_size.pl — NDBCLUSTER Size Requirement Estimator

This is a Perl script that can be used to estimate the amount of space that would be required by a MySQL database if it were converted to use the NDBCLUSTER storage engine. Unlike the other utilities discussed in this section, it does not require access to a MySQL Cluster (in fact, there is no reason for it to do so). However, it does need to access the MySQL server on which the database to be tested resides.

Requirements:

  • A running MySQL server. The server instance does not have to provide support for MySQL Cluster.

  • A working installation of Perl.

  • The DBI and HTML::Template modules, both of which can be obtained from CPAN if they are not already part of your Perl installation. (Many Linux and other operating system distributions provide their own packages for one or both of these libraries.)

  • The ndb_size.tmpl template file, which you should be able to find in the share/mysql directory of your MySQL installation. This file should be copied or moved into the same directory as ndb_size.pl—if it is not there already—before running the script.

  • A MySQL user account having the necessary privileges. If you do not wish to use an existing account, then creating one using GRANT USAGE ON db_name.*—where db_name is the name of the database to be examined—is sufficient for this purpose.

ndb_size.pl and ndb_size.tmpl can also be found in the MySQL sources in storage/ndb/tools.

Usage: 

perl ndb_size.pl db_name hostname username password > file_name.html

The command shown connects to the MySQL server at hostname using the account of the user username having the password password, analyzes all of the tables in database db_name, and generates a report in HTML format which is directed to the file file_name.html. (Without the redirection, the output is sent to stdout.) This figure shows a portion of the generated ndb_size.html output file, as viewed in a Web browser:

Partial sample output from ndb_size.pl as viewed in a Web browser.

The output from this script includes:

  • Minimum values for the DataMemory, IndexMemory, MaxNoOfTables, MaxNoOfAttributes, MaxNoOfOrderedIndexes, MaxNoOfUniqueHashIndexes, and MaxNoOfTriggers configuration parameters required to accommodate the tables analyzed.

  • Memory requirements for all of the tables, attributes, ordered indexes, and unique hash indexes defined in the database.

  • The IndexMemory and DataMemory required per table and table row.

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